PIC16F microcontroller write their own serial Modbus slave protocol is based on the 485 if you want to add yourself can add, there are timeouts check processing hosts file in another polling mechanism DIP switches to the number of polling slave

PIC_MODBUS\BaseTypes.h
..........\Modbus.c
..........\Modbus.h
..........\.ODBUS.X\build\default\debug\_ext\1472\Modbus.p1
..........\........\.....\.......\.....\....\....\Modbus.p1.d
..........\........\.....\.......\.....\....\....\Modbus.pre
..........\........\.....\.......\.....\....\....\newmain.p1
..........\........\.....\.......\.....\....\....\newmain.p1.d
..........\........\.....\.......\.....\....\....\newmain.pre
..........\........\.....\.......\.....\....\....\Time.p1
..........\........\.....\.......\.....\....\....\Time.p1.d
..........\........\.....\.......\.....\....\....\Time.pre
..........\........\.....\.......\.....\....\....\Uart.p1
..........\........\.....\.......\.....\....\....\Uart.p1.d
..........\........\.....\.......\.....\....\....\Uart.pre
..........\........\.....\.......\production\_ext\1472\Modbus.p1
..........\........\.....\.......\..........\....\....\Modbus.p1.d
..........\........\.....\.......\..........\....\....\Modbus.pre
..........\........\.....\.......\..........\....\....\newmain.p1
..........\........\.....\.......\..........\....\....\newmain.p1.d
..........\........\.....\.......\..........\....\....\newmain.pre
..........\........\.....\.......\..........\....\....\Time.p1
..........\........\.....\.......\..........\....\....\Time.p1.d
..........\........\.....\.......\..........\....\....\Time.pre
..........\........\.....\.......\..........\....\....\Uart.p1
..........\........\.....\.......\..........\....\....\Uart.p1.d
..........\........\.....\.......\..........\....\....\Uart.pre
..........\........\dist\default\debug\MODBUS.X.debug.cmf
..........\........\....\.......\.....\MODBUS.X.debug.elf
..........\........\....\.......\.....\MODBUS.X.debug.hxl
..........\........\....\.......\.....\MODBUS.X.debug.lst
..........\........\....\.......\.....\MODBUS.X.debug.map
..........\........\....\.......\.....\MODBUS.X.debug.obj
..........\........\....\.......\.....\MODBUS.X.debug.rlf
..........\........\....\.......\.....\MODBUS.X.debug.sdb
..........\........\....\.......\.....\MODBUS.X.debug.sym
..........\........\....\.......\production\MODBUS.X.production.cmf
..........\........\....\.......\..........\MODBUS.X.production.elf
..........\........\....\.......\..........\MODBUS.X.production.hex
..........\........\....\.......\..........\MODBUS.X.production.hxl
..........\........\....\.......\..........\MODBUS.X.production.lst
..........\........\....\.......\..........\MODBUS.X.production.map
..........\........\....\.......\..........\MODBUS.X.production.obj
..........\........\....\.......\..........\MODBUS.X.production.rlf
..........\........\....\.......\..........\MODBUS.X.production.sdb
..........\........\....\.......\..........\MODBUS.X.production.sym
..........\........\funclist
..........\........\l.obj
..........\........\Makefile
..........\........\nbproject\configurations.xml
..........\........\.........\Makefile-default.mk
..........\........\.........\Makefile-genesis.properties
..........\........\.........\Makefile-impl.mk
..........\........\.........\Makefile-local-default.mk
..........\........\.........\Makefile-variables.mk
..........\........\.........\Package-default.bash
..........\........\.........\private\configurations.xml
..........\........\.........\.......\private.properties
..........\........\.........\.......\private.xml
..........\........\.........\.......\SuppressibleMessageMemo.properties
..........\........\.........\project.properties
..........\........\.........\project.xml
..........\newmain.c
..........\Project.h
..........\Time..h
..........\Time.c
..........\Uart.c
..........\Uart.h
..........\MODBUS.X\build\default\debug\_ext\1472
..........\........\.....\.......\production\_ext\1472
..........\........\.....\.......\debug\_ext
..........\........\.....\.......\production\_ext
..........\........\.....\.......\debug
..........\........\.....\.......\production
..........\........\dist\default\debug
..........\........\....\.......\production
..........\........\build\default
..........\........\debug\def

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